U.S. patent application number 15/001558 was filed with the patent office on 2016-07-21 for imaging lens and imaging apparatus including the same.
The applicant listed for this patent is Samsung Electronics Co., Ltd.. Invention is credited to Yong-wook KIM, Tae-youn LEE, Jung-pa SEO.
Application Number | 20160209627 15/001558 |
Document ID | / |
Family ID | 55072586 |
Filed Date | 2016-07-21 |
United States Patent
Application |
20160209627 |
Kind Code |
A1 |
SEO; Jung-pa ; et
al. |
July 21, 2016 |
Imaging Lens and Imaging Apparatus Including the Same
Abstract
An imaging lens includes a first lens having a convex surface
toward an object and positive refractive power, a second lens
having positive or negative refractive power, a third lens having
positive or negative refractive power, a fourth lens having a
convex surface toward an image plane and positive refractive power,
and a fifth lens having a concave surface toward an object and
negative refractive power. The first through fifth lenses are
arranged in order from an object to an image plane. The imaging
lens satisfies the condition
-0.2.ltoreq.(Y-y.sub.p)/y.sub.p.ltoreq.-0.05, wherein Y indicates
an image height of a real chief ray, and y.sub.p indicates an image
height of a paraxial chief ray.
Inventors: |
SEO; Jung-pa; (Suwon-si,
KR) ; LEE; Tae-youn; (Yongin-si, KR) ; KIM;
Yong-wook; (Suwon-si, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Electronics Co., Ltd. |
Suwon-si |
|
KR |
|
|
Family ID: |
55072586 |
Appl. No.: |
15/001558 |
Filed: |
January 20, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 9/60 20130101; G02B
13/0045 20130101; G02B 27/0025 20130101 |
International
Class: |
G02B 13/00 20060101
G02B013/00; G02B 27/00 20060101 G02B027/00; G02B 9/60 20060101
G02B009/60 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 20, 2015 |
KR |
10-2015-0009339 |
Claims
1. An imaging lens comprising: a first lens having a convex surface
toward an object and positive refractive power; a second lens
having positive or negative refractive power; a third lens having
positive or negative refractive power; a fourth lens having a
convex surface toward an image plane and positive refractive power;
and a fifth lens having a concave surface toward an object and
negative refractive power, wherein the first lens, the second lens,
the third lens, the fourth lens, and the fifth lens are arranged in
order from an object to an image plane, wherein the imaging lens
satisfies: -0.2.ltoreq.(Y-y.sub.p)/y.sub.p.ltoreq.-0.05, wherein Y
indicates an image height of a real chief ray, and y.sub.p
indicates an image height of a paraxial chief ray.
2. The imaging lens of claim 1, wherein the imaging lens satisfies:
0.8<TL/f<1.5, wherein TL indicates a distance along an
optical axis between a vertex of an object side surface of the
first lens to the image plane, and f indicates a focal length of
the imaging lens.
3. The imaging lens of claim 1, wherein the imaging lens satisfies:
0.7<f/f4<2.5, wherein f indicates a focal length of the
imaging lens, and f4 indicates a focal length of the fourth
lens.
4. The imaging lens of claim 1, wherein the imaging lens satisfies:
1.0<|f/f5|<4.0, wherein f indicates a focal length of the
imaging lens, and f5 indicates a focal length of the fifth
lens.
5. The imaging lens of claim 1, wherein the imaging lens satisfies:
0.2<R1/f<1.0, wherein R1 indicates a radius of curvature of
the object side surface of the first lens, and f indicates a focal
length of the imaging lens.
6. The imaging lens of claim 1, wherein the imaging lens satisfies:
f/EPD.ltoreq.2.5, wherein f indicates a focal length of the imaging
lens, and EPD indicates a diameter of an entrance pupil of the
imaging lens.
7. The imaging lens of claim 1, wherein one of the second and third
lenses has positive refractive power and the other of the second
and third lenses has negative refractive power.
8. The imaging lens of claim 7, wherein the imaging lens satisfies:
1.6.ltoreq.N.sub.1-4.ltoreq.2.2, and 15.ltoreq.V.sub.1-4.ltoreq.29,
wherein N.sub.1-4 and V.sub.1-4 respectively are a refractive index
and an Abbe number of a lens having negative refractive power from
among the second lens and the third lens.
9. The imaging lens of claim 1, wherein the imaging lens satisfies:
1.51<N.sub.5<1.56, wherein N.sub.5 indicates a refractive
index of the fifth lens.
10. The imaging lens of claim 1, wherein each of the first to fifth
lenses has at least one aspheric surface.
11. The imaging lens of claim 1, wherein an image side surface of
the fifth lens is an aspheric surface without an inflection
point.
12. An imaging lens comprising: a first lens having a convex
surface toward an object and positive refractive power; a second
lens having positive or negative refractive power; a third lens
having positive or negative refractive power; a fourth lens having
a convex surface toward an image plane and positive refractive
power; and a fifth lens having a concave surface toward an object
and negative refractive power, wherein the first lens, the second
lens, the third lens, the fourth lens, and the fifth lens are
arranged in order from an object to an image plane, wherein the
imaging lens satisfies:
30.degree..ltoreq.CRA.sub.max.ltoreq.45.degree., and
0.5<TL/(2*y.sub.p)<0.75, wherein CRA.sub.max indicates a
maximum value of a chief ray angle (CRA) incident to the image
plane according to image heights, TL indicates a distance along an
optical axis between a vertex of an object side surface of the
first lens to the image plane, and y.sub.p indicates an image
height of a paraxial chief ray.
13. The imaging lens of claim 12, wherein the imaging lens
satisfies: -20.ltoreq.(((1/f)*(Y/tan .theta.)-1))*100.ltoreq.-5,
wherein f indicates a focal length of the imaging lens, Y indicates
an image height of a real chief ray, and .theta. indicates a half
field of view.
14. The imaging lens of claim 12, wherein the imaging lens
satisfies: -1.6<(R.sub.9+R.sub.10)/(R.sub.9-R.sub.10)<-0.7,
wherein R.sub.9 indicates a radius of curvature of an object side
surface of the fifth lens, and R.sub.10 indicates a radius of
curvature of an image side surface of the fifth lens.
15. The imaging lens of claim 12, wherein one of the second and
third lenses has positive refractive power and the other of the
second and third lenses has negative refractive power.
16. The imaging lens of claim 12, wherein the imaging lens
satisfies: 1.6.ltoreq.N.sub.1-4.ltoreq.2.2, and
15.ltoreq.V.sub.1-4.ltoreq.29, wherein N.sub.1-4 and V.sub.1-4
respectively are a refractive index and an Abbe number of a lens
having negative refractive power from among the second lens and the
third lens.
17. The imaging lens of claim 12, wherein each of the first to
fifth lenses has at least one aspheric surface.
18. The imaging lens of claim 14, wherein the image side surface of
the fifth lens is an aspheric surface without an inflection
point.
19. An imaging apparatus comprising: an imaging lens comprising: a
first lens having a convex surface toward an object and positive
refractive power; a second lens having positive or negative
refractive power; a third lens having positive or negative
refractive power; a fourth lens having a convex surface toward an
image plane and positive refractive power; and a fifth lens having
a concave surface toward an object and negative refractive power,
wherein the first lens, the second lens, the third lens, the fourth
lens, and the fifth lens are arranged in order from an object to an
image plane, wherein the imaging lens satisfies:
-0.2.ltoreq.(Y-y.sub.p)/y.sub.p.ltoreq.-0.05, wherein Y indicates
an image height of a real chief ray, and y.sub.p indicates an image
height of a paraxial chief ray; and an image sensor configured to
convert an optical image formed by the imaging lens into an
electric signal.
20. The imaging apparatus of claim 19, further comprising a body
having a body thickness of 7 mm or less, and the imaging lens is
arranged such that an optical axis direction of the imaging lens
corresponds to a direction of the body thickness.
Description
RELATED APPLICATION(S)
[0001] This application claims the benefit of Korean Patent
Application No. 10-2015-0009339, filed on Jan. 20, 2015, in the
Korean Intellectual Property Office, the disclosure of which is
incorporated herein in its entirety by reference.
BACKGROUND
[0002] The present disclosure relates to an imaging lens and an
imaging apparatus including the same.
[0003] Digital cameras and video cameras including solid-state
imaging devices, such as a charge-coupled device (CCD) or
complementary metal-oxide semiconductor (CMOS) are widely used.
[0004] Imaging apparatuses that include solid-state imaging devices
are useful as they can be miniaturized. Recently, solid-state
imaging devices have been applied to mobile devices such as
smartphones.
[0005] As the thicknesses of smartphones decrease, reducing the
sizes of imaging lens modules used in the smartphones is becoming
more important. Also, due to the increasing number of consumers
with camera expertise, it is necessary to miniaturize the imaging
lens as well as provide a design for guaranteeing satisfactory
optical performance of the imaging lens according to the purpose of
use.
SUMMARY
[0006] Provided are a micro imaging lens that may be used in a slim
mobile device and an imaging apparatus including the micro imaging
lens.
[0007] Additional aspects will be set forth in part in the
description which follows and, in part, will be apparent from the
description, or may be learned by practice of the presented
exemplary embodiments.
[0008] According to an aspect of an exemplary embodiment, an
imaging lens includes a first lens having a convex surface toward
an object and positive refractive power, a second lens having
positive or negative refractive power, a third lens having positive
or negative refractive power, a fourth lens having a convex surface
toward an image plane and positive refractive power, and a fifth
lens having a concave surface toward an object and negative
refractive power. The first through fifth lenses are arranged in
order from an object to an image plane, and the imaging lens
satisfies -0.2.ltoreq.(Y-y.sub.p)/y.sub.p.ltoreq.-0.05, wherein Y
indicates an image height of a real chief ray, and y.sub.p
indicates an image height of a paraxial chief ray.
[0009] The imaging lens may satisfy 0.8<TL/f<1.5, wherein TL
indicates a distance along an optical axis between a vertex of the
object side surface of the first lens to the image plane, and f
indicates a focal length of the imaging lens.
[0010] The imaging lens may satisfy 0.7<f/f4<2.5, wherein f
indicates a focal length of the imaging lens, and f4 indicates a
focal length of the fourth lens.
[0011] The imaging lens may satisfy 1.0<|f/f5|<4.0, wherein f
indicates a focal length of the imaging lens, and f5 indicates a
focal length of the fifth lens.
[0012] The imaging lens may satisfy 0.2<R1/f<1.0, wherein R1
indicates a radius of curvature of the object side surface of the
first lens, and f indicates a focal length of the imaging lens.
[0013] The imaging lens may satisfy f/EPD.ltoreq.2.5, wherein f
indicates a focal length of the imaging lens, and EPD indicates a
diameter of an entrance pupil of the imaging lens.
[0014] One of the second and third lenses may have positive
refractive power and another may have negative refractive
power.
[0015] The imaging lens may satisfy 1.6.ltoreq.N.sub.1-4.ltoreq.2.2
and 15.ltoreq.V.sub.1-4.ltoreq.29, wherein N.sub.1-4 and V.sub.1-4
respectively are a refractive index and an Abbe number of a lens
having negative refractive power from among the second lens and the
third lens.
[0016] The imaging lens may satisfy 1.51<N.sub.5<1.56,
wherein N.sub.5 indicates a refractive index of the fifth lens.
[0017] Each of the first to fifth lenses may have at least one
aspheric surface.
[0018] An image side surface of the fifth lens may have an aspheric
surface without an inflection point.
[0019] According to an aspect of another exemplary embodiment, an
imaging lens includes a first lens having a convex surface toward
an object and positive refractive power, a second lens having
positive or negative refractive power, a third lens having positive
or negative refractive power, a fourth lens having a convex surface
toward an image plane and positive refractive power, and a fifth
lens having a concave surface toward an object and negative
refractive power. The first through fifth lenses are arranged in
order from an object to an image plane, and the imaging lens
satisfies: 30.degree..ltoreq.CRA.sub.max.ltoreq.45.degree. and
0.5<TL/(2*y.sub.p)<0.75, wherein CRA.sub.max indicates the
maximum value of a chief ray angle (CRA) incident to the image
plane according to image heights, TL indicates a distance along the
optical axis between a vertex of an object side surface of the
first lens to the image, and y.sub.p indicates an image height of a
paraxial chief ray.
[0020] The imaging lens may satisfy -20.ltoreq.(((1/f)*(Y/tan
.theta.)-1))*100.ltoreq.-5, wherein f indicates a focal length of
the imaging lens, Y indicates an image height of a real chief ray,
and .theta. indicates a half field of view.
[0021] The imaging lens may satisfy
-1.6<(R.sub.9+R.sub.10)/(R.sub.9-R.sub.10)<-0.7, wherein
R.sub.9 indicates a radius of curvature of an object side surface
of the fifth lens, and R.sub.10 indicates a radius of curvature of
an image side surface of the fifth lens.
[0022] One of the second and third lenses may have positive
refractive power and another may have negative refractive
power.
[0023] The imaging lens may satisfy 1.6.ltoreq.N.sub.1-4.ltoreq.2.2
and 15.ltoreq.V.sub.1-4.ltoreq.29, wherein N.sub.1-4 and V.sub.1-4
respectively are a refractive index and an Abbe number of a lens
having negative refractive power from among the second lens and the
third lens.
[0024] Each of the first to fifth lenses may have at least one
aspheric surface.
[0025] The image side surface of the fifth lens may be an aspheric
surface without an inflection point.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] These and/or other aspects will become apparent and more
readily appreciated from the following description of the exemplary
embodiments, taken in conjunction with the accompanying drawings in
which:
[0027] FIG. 1 is a diagram of an optical arrangement of an imaging
lens, according to a first exemplary embodiment;
[0028] FIG. 2 is a conceptual diagram for describing negative
distortion;
[0029] FIG. 3 is a conceptual diagram for describing a chief ray
angle (CRA);
[0030] FIG. 4 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of an
imaging lens, according to the first exemplary embodiment;
[0031] FIG. 5 is an aberration diagram of comatic aberration of an
imaging lens, according to the first exemplary embodiment;
[0032] FIG. 6 is a diagram of negative TV distortion of an imaging
lens, according to the first exemplary embodiment;
[0033] FIG. 7 is a graph of a CRA per field of an imaging lens,
according to the first exemplary embodiment;
[0034] FIG. 8 is a diagram of an optical arrangement of an imaging
lens, according to a second exemplary embodiment;
[0035] FIG. 9 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of an
imaging lens, according to the second exemplary embodiment;
[0036] FIG. 10 is an aberration diagram of comatic aberration of an
imaging lens, according to the second exemplary embodiment;
[0037] FIG. 11 is a diagram of negative TV distortion of an imaging
lens, according to the second exemplary embodiment;
[0038] FIG. 12 is a graph of a CRA per field of an imaging lens,
according to the second exemplary embodiment;
[0039] FIG. 13 is a diagram of an optical arrangement of an imaging
lens, according to a third exemplary embodiment;
[0040] FIG. 14 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of an
imaging lens, according to the third exemplary embodiment;
[0041] FIG. 15 is an aberration diagram of comatic aberration of an
imaging lens, according to the third exemplary embodiment;
[0042] FIG. 16 is a diagram of negative TV distortion of an imaging
lens, according to the third exemplary embodiment;
[0043] FIG. 17 is a graph of a CRA per field of an imaging lens,
according to the third exemplary embodiment;
[0044] FIG. 18 is a diagram of an optical arrangement of an imaging
lens, according to a fourth exemplary embodiment;
[0045] FIG. 19 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of an
imaging lens, according to the fourth exemplary embodiment;
[0046] FIG. 20 is an aberration diagram of comatic aberration of an
imaging lens, according to the fourth exemplary embodiment;
[0047] FIG. 21 is a diagram of negative TV distortion of an imaging
lens, according to the fourth exemplary embodiment;
[0048] FIG. 22 is a graph of a CRA per field of an imaging lens,
according to the fourth exemplary embodiment;
[0049] FIG. 23 is a diagram of an optical arrangement of an imaging
lens, according to a fifth exemplary embodiment;
[0050] FIG. 24 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of an
imaging lens, according to the fifth exemplary embodiment;
[0051] FIG. 25 is an aberration diagram of comatic aberration of an
imaging lens, according to the fifth exemplary embodiment;
[0052] FIG. 26 is a diagram of negative TV distortion of an imaging
lens, according to the fifth exemplary embodiment;
[0053] FIG. 27 is a graph of a CRA per field of an imaging lens,
according to the fifth exemplary embodiment; and
[0054] FIG. 28 is a perspective view of an electronic device
according to an exemplary embodiment.
DETAILED DESCRIPTION
[0055] Reference will now be made in detail to exemplary
embodiments, examples of which are illustrated in the accompanying
drawings. Expressions such as "at least one of," when preceding a
list of elements, modify the entire list of elements and do not
modify the individual elements of the list.
[0056] FIG. 1 is a diagram of an optical arrangement of an imaging
lens 1000, according to a first exemplary embodiment.
[0057] The imaging lens 1000 may include, sequentially from an
object OBJ to an image plane IMG, a first lens 101 having a convex
surface toward object side and positive refractive power, a second
lens 201 having negative refractive power, a third lens 301 having
positive refractive power, a fourth lens 401 having a convex
surface toward image plane IMG and positive refractive power, and a
fifth lens 501 having negative refractive power.
[0058] A filter 600 may be provided between the fifth lens 501 and
the image plane IMG. The filter 600 may be, for example, an
infrared light blocking filter. The filter 600 may be optional. A
cover glass may be provided with the filter 600 or selectively.
[0059] The imaging lens 1000 may determine details of the first to
fifth lenses 101 to 501 such that a total length is reduced and
satisfactory optical performance is provided. Each of the first
lens 101, the second lens 201, the third lens 301, the fourth lens
401, and the fifth lens 501 may include an aspheric surface for
aberration correction. For example, at least one surface of each of
the first lens 101, the second lens 201, the third lens 301, the
fourth lens 401, and the fifth lens 501 may be an aspheric surface.
Alternatively, an image side surface of the fifth lens 501 may be
an aspheric surface without an inflection point.
[0060] The imaging lens 1000 may satisfy the following condition,
COND. (1):
-0.2.ltoreq.(Y-y.sub.p)/y.sub.p.ltoreq.-0.05, COND. (1)
wherein Y indicates an image height of a real chief ray, i.e., an
actual image height, and y.sub.p indicates an image height of a
paraxial chief ray.
[0061] According to COND. (1), the imaging lens 1000 has negative
optical distortion and thus the size of the imaging lens 1000 is
reduced.
[0062] FIG. 2 is a conceptual diagram for describing negative
distortion. Referring to FIG. 2, negative distortion implies that
the actual image height (Y) is lower than the image height of the
paraxial chief ray (y.sub.p). When COND. (1) is satisfied, the
actual image height may be lower than a height of an image sensor
provided at the image plane IMG. Thus, the total length of the
imaging lens 1000 may be reduced. Also, the optical distortion may
be corrected. Unlike a general imaging lens having optical
distortion of .+-.2%, the present exemplary embodiment may reduce
size because an optical distortion of up to -20% is allowed.
[0063] The condition, COND. (1) may be modified as below by using
y.sub.p=f*tan .theta.:
-20.ltoreq.(((1/f)*(Y/tan .theta.)-1))*100.ltoreq.-5, COND. (2)
wherein f indicates a focal length of the imaging lens 1000, Y
indicates the image height of the real chief ray, and .theta.
indicates a half field of view.
[0064] The imaging lens 1000 may satisfy COND. (3):
0.8<TL/f<1.5, COND. (3)
wherein TL indicates the total length, i.e., a distance along an
optical axis between a vertex of the object side surface of the
first lens 101 to the image plane IMG, and f indicates the focal
length of the imaging lens 1000.
[0065] When a filter, for example, an infrared light blocking
filter or a cover glass, is provided on the optical axis, an air
reduced value is applied for TL. That is, when a refractive index
and a thickness of the filter 600 are n and d, respectively, the
value of (1-(1/n))*d is applied when calculating TL.
[0066] The condition, COND. (3) may ensure optimization between
size reduction and aberration correction.
[0067] When the value of TL/f exceeds an upper limit, aberration
correction along the optical axis or not along the optical axis may
be satisfactory but size reduction may be difficult due to a long
total length.
[0068] When the value of TL/f exceeds a lower limit, size reduction
may be satisfactory but manufacturing of lenses may be difficult
due to reduction in thicknesses of the lenses. Also, productivity
may decrease due to increasing sensitivity to manufacturing
error.
[0069] The imaging lens 1000 may satisfy the following condition,
COND. (4):
0.7<f/f4<2.5, COND. (4)
wherein f indicates the focal length of the imaging lens 1000, and
f4 indicates the focal length of the fourth lens 401.
[0070] The imaging lens 1000 may also satisfy the following
condition, COND. (5):
1.0<|f/f5|<4.0, COND. (5)
wherein f indicates the focal length of the imaging lens 1000, and
f5 indicates the focal length of the fifth lens 501.
[0071] The conditions, COND. (4) and COND. (5) determine an
appropriate range of respective refractive powers of the fourth and
fifth lenses 401 and 501 with regard to correction of astigmatic
field curvature aberration. That is, when the condition, COND. (4)
and COND. (5), are not satisfied, it is difficult to correct the
astigmatic field curvature aberration.
[0072] The imaging lens 1000 may satisfy the following condition,
COND. (6):
0.2<R1/f<1.0, COND. (6)
wherein R1 indicates a radius of curvature of the object side
surface of the first lens 101, and f indicates the focal length of
the imaging lens 1000.
[0073] The condition, COND. (6) determines a ratio of the radius of
curvature of the object side surface of the first lens 101 to the
focal length of the imaging lens 1000. The condition, COND. (6) is
provided for appropriate correction of spherical aberration. That
is, when the condition, COND. (6) is not satisfied, the spherical
aberration increases.
[0074] The imaging lens 1000 may satisfy the following condition,
COND. (7):
f/EPD.ltoreq.2.5, COND. (7)
wherein f indicates the focal length of the imaging lens 1000, and
EPD indicates an entrance pupil diameter of the imaging lens
1000.
[0075] The condition, COND. (7) is related to the F-number and is
provided for manufacturing a bright lens with small total
length.
[0076] The imaging lens 1000 may satisfy the following conditions,
COND. (8) and COND. (9):
1.6.ltoreq.N.sub.1-4.ltoreq.2.2, COND. (8)
15.ltoreq.V.sub.1-4.ltoreq.29, COND. (9)
wherein N.sub.1-4 and V.sub.1-4 respectively are a refractive index
and the Abbe number of a lens having negative refractive power,
from among the second lens 201 and the third lens 301.
[0077] The conditions, COND. (6) and COND. (9) are for correcting
longitudinal color aberration along an axis. The total length may
be reduced and longitudinal color aberration may be corrected by
determining the refractive index and the Abbe number of the lens
having negative refractive power from among the second lens 201 and
the third lens 301 based on the conditions, COND. (6) and COND.
(9).
[0078] The imaging lens 1000 may satisfy the following condition,
COND. (10):
1.51<N.sub.5<1.56, COND. (10)
wherein N.sub.5 indicates a refractive index of the fifth lens
501.
[0079] The condition, COND. (10) is related to the refractive index
of the fifth lens 501, for example, a d-line refractive index. A
material of the fifth lens 501 may be selected based on the
condition, COND. (10). Such a range of the refractive index may be
obtained by using a plastic material. Accordingly, manufacturing
costs may be reduced, manufactured products may be light-weight,
and manufacturing of lenses may be more convenient.
[0080] The imaging lens 1000 may satisfy the following condition,
COND. (11):
30.degree..ltoreq.CRA.sub.max.ltoreq.45.degree., COND. (11)
wherein CRA.sub.max indicates the maximum value of a chief ray
angle (CRA) incident to the image plane IMG according to image
heights.
[0081] The condition, COND. (11) determines a range of the maximum
value of the CRA of chief rays incident on the image plane IMG.
[0082] FIG. 3 is a conceptual diagram for describing a CRA.
[0083] The CRA of chief rays traveling toward the image plane IMG
varies according to image heights. When the maximum value of the
CRA satisfies the condition, COND. (11), the imaging lens 1000 may
be reduced in size, and a wide angle may be obtained. Also, based
on the condition, COND. (11), a surface of the fifth lens 501
facing image plane IMG, which is located nearest to the image plane
IMG in the imaging lens 1000, may be formed as an aspheric surface
with no inflection points.
[0084] The imaging lens 1000 may satisfy the following condition,
COND. (12):
0.5<TL/(2*y.sub.p)<0.75, COND. (12)
wherein TL indicates a distance along the optical axis between the
vertex of a surface of the first lens 101 facing the object to the
image plane IMG, and y.sub.p indicates the image height of the
paraxial chief ray.
[0085] Similar to the condition, COND. (3), when a filter is
provided on the optical axis, an air reduced value is applied for
TL.
[0086] The condition, COND. (12) is for reducing the total length
of the imaging lens 1000.
[0087] The imaging lens 1000 may satisfy the following condition,
COND. (13):
-1.6<(R.sub.9+R.sub.10)/(R.sub.9-R.sub.10)<-0.7, COND.
(13)
wherein R.sub.9 indicates a radius of curvature of an object side
surface of the fifth lens 501, and R.sub.10 indicates a radius of
curvature of the image side surface of the fifth lens 501.
[0088] Based on the condition, COND. (13), the fifth lens 501 may
be formed to have an aspheric surface, in which the object side
surface is concave and the image side surface has no inflection
points.
[0089] Hereinafter, various exemplary embodiments will be described
with lens data. In the lens data, ST indicates aperture stop, and
an asterisk "*" behind the number of a surface indicates that the
surface is an aspheric surface. Millimeter "mm" is used as the unit
of focal lengths, overall optical lengths, radius of curvatures,
thicknesses, and intervals.
[0090] An aspheric surface is defined as below:
Z = cY 2 1 + 1 - ( 1 + K ) c 2 Y 2 + AY 4 + BY 6 + CY 8 + DY 10 +
EY 12 + FY 14 EQN . ( 1 ) ##EQU00001##
wherein Z indicates a distance from a vertex of a lens in a
direction along an optical axis, Y indicates a distance in a
direction perpendicular to the optical axis, K is a conic constant,
A to F are aspheric surface parameters, and c indicates a
reciprocal for a radius of curvature (1/R) with regard to the
vertex of the lens.
First Exemplary Embodiment
[0091] FIG. 1 is a diagram of an optical arrangement of the imaging
lens 1000, according to the first exemplary embodiment.
[0092] The imaging lens 1000 may include, sequentially from the
object OBJ to the image plane IMG, the first lens 101 having the
convex surface toward object and positive refractive power, the
second lens 201 having negative refractive power, the third lens
301 having positive refractive power, the fourth lens 401 having
the convex surface toward image plane and positive refractive
power, and the fifth lens 501 having negative refractive power.
[0093] Lens data of the first exemplary embodiment is as below.
TABLE-US-00001 TABLE I Radius of Thickness or Refractive Index Abbe
Number Curvature Intervals (nd) (vd) OBJ infinity infinity 1(ST)*
1.504 0.548 1.544 56.09 2* 3.845 0.200 3* -56.019 0.300 2.017 20.55
4* 7.522 0.069 5* 6.272 0.661 1.531 55.91 6* -7.835 0.356 7*
182.130 0.697 1.544 56.09 8* -2.205 0.809 9* -1.115 0.450 1.544
56.09 10* infinity 0.040 11 infinity 0.100 1.517 64.2 12 infinity
0.498 IMG infinity 0.000
TABLE-US-00002 TABLE II Surface K A B C D E F G 1 2.5030E-01
5.0750E-04 2.1320E-02 -1.2843E-02 1.4129E-02 2.8946E-03 1.0022E-02
3.5333E-03 2 -2.2136E+01 5.0897E-02 -2.1860E-02 5.6641E-02
-1.0407E-02 9.0643E-02 8.8656E-03 2.0839E-04 3 -1.0000E+00
-3.8435E-02 7.9805E-03 -1.9296E-02 9.9303E-03 -1.3943E-02
-1.4055E-03 3.5919E-05 4 -1.4554E+01 -9.2113E-03 4.4310E-02
-2.4070E-02 9.3174E-03 9.6466E-03 -8.7822E-03 5.3190E-03 5
-9.9000E+01 1.2121E-02 1.2872E-02 -3.5254E-02 1.0847E-02 4.0602E-02
-2.9108E-02 -1.3178E-04 6 1.5280E+00 -4.1218E-02 -1.3884E-02
7.9787E-03 -6.4351E-03 -2.6739E-03 5.5963E-04 2.5253E-03 7
-1.0000E+00 -4.3583E-02 -2.2731E-02 8.3023E-03 -1.3499E-02
3.0683E-03 2.0186E-03 -1.8610E-03 8 -8.2777E+00 -9.0500E-02
2.7321E-02 -1.6503E-02 5.0236E-03 -5.0365E-04 1.8073E-05 1.8348E-05
9 -8.9642E-01 -3.6557E-02 8.4515E-03 2.5892E-03 3.4904E-04
4.1019E-05 -1.6004E-05 -5.4632E-06 10 2.0022E+01 -4.6098E-02
1.4122E-02 -2.9295E-03 3.0833E-04 -1.3471E-05 -8.9154E-07
9.1418E-08
[0094] FIG. 4 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of the
imaging lens 1000, according to the first exemplary embodiment.
FIG. 5 is an aberration diagram of comatic aberration of the
imaging lens 1000, according to the first exemplary embodiment. The
longitudinal spherical aberration and the comatic aberration are
shown with regard to rays with wavelengths of 656.27 nm, 587.56 nm,
546.07 nm, 486.13 nm, and 435.84 nm, and the astigmatic field
curvature and the distortion are shown with regard to rays with a
wavelength of 546.07 nm. Also, in a graph of the astigmatic field
curvature, a sagittal field curvature and a tangential field
curvature are respectively shown as X and Y.
[0095] FIG. 6 is a diagram of negative TV distortion of the imaging
lens 1000, according to the first exemplary embodiment.
[0096] Referring to FIG. 6, solid lines indicate a field of view
(FOV) of paraxial chief rays, and dashed lines indicate an actual
FOV. Due to negative optical distortion, the FOV indicated by the
dashed lines has a barrel shape. The TV distortion may be
calculated based on the distortion aberration diagram of FIG. 4.
The TV distortion is a value obtained by subtracting a distortion
aberration of 0.6F (short side) from a distortion aberration of
1.0F (diagonal direction) and dividing the subtracted value in
half. The TV distortion is disclosed in the upper right corner. The
lower left corner shows a value obtained by subtracting a
distortion aberration of 0.8F (long side) from the distortion
aberration of 1.0F (diagonal direction) and the subtracted value in
half, and the lower right corner shows the optical distortion of
FIG. 4.
[0097] FIG. 7 is a graph of a CRA per field of the imaging lens
1000, according to the first exemplary embodiment.
Second Exemplary Embodiment
[0098] FIG. 8 is a diagram of an optical arrangement of an imaging
lens 2000, according to a second exemplary embodiment.
[0099] The imaging lens 2000 includes, sequentially from an object
OBJ to an image plane IMG, a first lens 102 having a convex surface
toward object and positive refractive power, a second lens 202
having positive refractive power, a third lens 302 having negative
refractive power, a fourth lens 402 having a convex surface toward
image plane and positive refractive power, and a fifth lens 502
having negative refractive power.
[0100] Lens data of the second exemplary embodiment is as
below.
TABLE-US-00003 TABLE III Radius of Thickness or Refractive Index
Abbe Number Curvature Intervals (nd) (vd) OBJ infinity infinity 1*
2.171 0.382 1.544 56.11 2(ST)* 2.648 0.110 3* 2.971 0.490 1.535
55.71 4* -4.351 0.030 5* -64.663 0.300 1.643 22.4 6* 3.654 0.244 7*
-82.393 0.868 1.544 56.11 8* -1.467 0.916 9* -1.091 0.450 1.544
56.11 10* infinity 0.030 11 infinity 0.100 1.517 64.20 12 infinity
0.530 IMG infinity 0.000
TABLE-US-00004 TABLE IV surface K A B C D E F G 1 -1.3362E+00
-2.9656E-02 -4.6954E-04 -1.7212E-02 8.8309E-02 -9.6141E-02
4.4512E-02 -1.2077E-02 2 5.8329E+00 -1.0656E-01 4.3773E-02
3.1856E-02 9.5432E-02 -2.1041E-03 -3.7479E-08 -9.5785E-08 3
-1.0000E+00 -3.7419E-02 -1.4672E-03 1.1882E-01 7.9025E-02
-1.0581E-01 2.0091E-03 -4.6108E-09 4 1.8830E+01 -8.2605E-02
4.4031E-02 3.0058E-01 -2.9924E-01 -6.0830E-02 -2.2329E-03
-5.3623E-03 5 -1.0000E+00 -1.3040E-01 1.2589E-01 1.3783E-01
-1.7963E-01 -4.8740E-02 -3.6843E-02 1.5436E-03 6 -1.0000E+00
-2.7157E-02 1.6753E-02 6.3504E-02 -7.4358E-02 3.7237E-02 1.1578E-02
-2.1031E-02 7 -1.0000E+00 -1.6128E-02 -3.1544E-02 4.2305E-03
1.1586E-02 -8.4897E-03 6.0119E-03 1.0564E-03 8 -5.4031E+00
-1.6183E-01 9.1349E-02 -6.1175E-02 1.3312E-02 -1.6852E-05
2.6392E-04 3.9193E-04 9 -1.5318E+00 -3.4593E-02 -3.1944E-02
-1.1247E-02 7.0852E-03 6.7777E-04 -6.0532E-04 9.7459E-05 10
-1.0000E+00 -1.4340E-02 -5.1625E-03 4.5758E-04 1.9252E-05
-1.6104E-05 3.8505E-06 -5.4312E-07
[0101] FIG. 9 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of the
imaging lens 2000, according to the second exemplary embodiment.
FIG. 10 is an aberration diagram of comatic aberration of the
imaging lens 2000, according to the second exemplary embodiment.
FIG. 11 is a diagram of negative TV distortion of the imaging lens
2000, according to the second exemplary embodiment. FIG. 12 is a
graph of a CRA per field of the imaging lens 2000, according to the
second exemplary embodiment.
Third Exemplary Embodiment
[0102] FIG. 13 is a diagram of an optical arrangement of an imaging
lens 3000, according to a third exemplary embodiment.
[0103] The imaging lens 3000 includes, sequentially from the object
OBJ to the image plane IMG, a first lens 103 having a convex
surface toward object and positive refractive power, a second lens
203 having positive refractive power, a third lens 303 having
negative refractive power, a fourth lens 403 having a convex
surface toward image plane and positive refractive power, and a
fifth lens 503 having negative refractive power.
[0104] Lens data of the third exemplary embodiment is as below.
TABLE-US-00005 TABLE V Radius of Thickness or Refractive Index Abbe
Number Curvature Intervals (nd) (vd) OBJ infinity infinity 1* 1.781
0.478 1.544 56.11 2(ST)* 4.933 0.110 3* 7.284 0.359 1.531 55.75 4*
-17.375 0.084 5* -10.686 0.300 2.100 16.8 6* -107.497 0.236 7*
-7.343 0.903 1.659 57.65 8* -1.579 0.869 9* -1.088 0.450 1.544
56.11 10* infinity 0.030 11 infinity 0.100 1.517 64.20 12 infinity
0.530 IMG infinity 0.000
TABLE-US-00006 TABLE VI Surface K A B C D E F G 1 -4.4559E-01
-1.5144E-02 -1.0171E-02 -2.0113E-02 5.1822E-02 -6.9813E-02
4.2710E-02 -1.2077E-02 2 1.5673E+01 -6.4609E-02 3.2940E-02
2.4176E-02 -1.2432E-02 -2.1041E-03 -3.7477E-08 -9.5785E-08 3
-1.0000E+00 -2.5892E-02 2.6738E-02 1.6349E-01 -1.1080E-01
-1.0581E-01 2.0091E-03 -4.6108E-09 4 1.5490E+02 -1.1458E-01
-9.7823E-03 2.8818E-01 -2.5627E-01 -6.0830E-02 -2.2329E-03
-5.3623E-03 5 -1.0000E+00 -8.1194E-02 4.1070E-02 4.7863E-02
3.4150E-02 -4.8740E-02 -3.6843E-02 1.5436E-03 6 -1.0000E+00
4.9017E-02 1.1539E-02 4.9529E-02 -5.1052E-02 4.4694E-02 1.2039E-02
-2.1031E-02 7 3.4292E+00 -2.0726E-02 -1.9857E-02 -3.1506E-02
5.8934E-03 9.9427E-03 -1.0757E-02 2.9150E-03 8 -5.8343E+00
-1.5930E-01 8.3331E-02 -5.9800E-02 1.2385E-02 -8.1155E-04
8.1735E-04 -7.4484E-04 9 -8.1415E-01 5.6883E-03 -2.5036E-02
-7.8312E-03 1.3735E-03 5.5238E-04 9.6753E-05 1.3435E-04 10
-1.0000E+00 -2.5422E-02 2.0873E-03 -1.6658E-03 2.7254E-04
-1.8409E-05 2.5685E-06 -5.5953E-07
[0105] FIG. 14 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of the
imaging lens 3000, according to the third exemplary embodiment.
FIG. 15 is an aberration diagram of comatic aberration of the
imaging lens 3000, according to the third exemplary embodiment.
FIG. 16 is a diagram of negative TV distortion of the imaging lens
3000, according to the third exemplary embodiment. FIG. 17 is a
graph of a CRA per field of the imaging lens 3000, according to the
third exemplary embodiment.
Fourth Exemplary Embodiment
[0106] FIG. 18 is a diagram of an optical arrangement of an imaging
lens 4000, according to a fourth exemplary embodiment.
[0107] The imaging lens 4000 includes, sequentially from the object
OBJ to the image plane IMG, a first lens 104 having a convex
surface toward object and positive refractive power, a second lens
204 having negative refractive power, a third lens 304 having
positive refractive power, a fourth lens 404 having a convex
surface toward image plane and positive refractive power, and a
fifth lens 504 having negative refractive power.
[0108] Lens data of the fourth exemplary embodiment is as
below.
TABLE-US-00007 TABLE VII Radius of Thickness or Refractive Index
Abbe Number Curvature Intervals (nd) (vd) OBJ infinity infinity
1(ST) infinity -0.270 2* 1.495 0.502 1.544 56.09 3* 3.977 0.224 4*
-21.682 0.300 1.801 24.62 5* 6.963 0.071 6* 5.863 0.651 1.531 55.91
7* -6.602 0.347 8* -425.860 0.657 1.544 56.09 9* -2.062 0.717 10*
-1.058 0.468 1.544 56.09 11* -1000.000 0.041 12 infinity 0.100
1.517 64.2 13 infinity 0.488 IMG infinity 0.000
TABLE-US-00008 TABLE VIII Surface K A B C D E F G 2 2.7019E-01
2.2348E-03 2.2043E-02 -1.1505E-02 1.6274E-02 5.4454E-03 1.3662E-02
3.5333E-03 3 -1.9353E+01 5.2206E-02 -2.3017E-02 5.6891E-02
-1.0194E-01 9.6877E-02 8.8656E-03 2.0839E-04 4 -1.0000E+00
-4.4088E-02 3.9707E-03 -2.6255E-02 1.1475E-03 -1.5211E-02
-1.4055E-03 3.5919E-05 5 -8.7162E+00 -7.9075E-03 4.4961E-02
-2.1979E-02 1.2432E-02 1.1375E-02 -1.1584E-02 5.3190E-03 6
-9.1637E+01 1.1134E-02 1.4241E-02 -3.3876E-02 1.1564E-02 4.1236E-02
-2.8357E-02 1.6001E-03 7 1.2275E+01 -4.7579E-02 -1.4012E-02
7.2495E-03 -7.6764E-03 -3.4497E-03 6.8258E-04 3.4521E-03 8
-1.0000E+00 -5.1562E-02 -2.5060E-02 7.3033E-03 -1.4279E-02
2.6164E-03 1.8457E-03 -1.9332E-03 9 -7.0115E+00 -9.3975E-02
2.6817E-02 -1.6698E-02 4.9799E-03 -4.9339E-04 3.4578E-05 3.0519E-05
10 -9.2099E-01 -3.2901E-02 9.1875E-03 2.7016E-03 3.7786E-04
4.6757E-05 -1.5877E-05 -6.1569E-06 11 2.0022E+01 -4.5026E-02
1.3728E-02 -2.8759E-03 3.0706E-04 -1.3775E-05 -8.8518E-07
1.0062E-07
[0109] FIG. 19 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of the
imaging lens 4000, according to the fourth exemplary embodiment.
FIG. 20 is an aberration diagram of comatic aberration of the
imaging lens 4000, according to the fourth exemplary embodiment.
FIG. 21 is a diagram of negative TV distortion of the imaging lens
4000, according to the fourth exemplary embodiment. FIG. 22 is a
graph of a CRA per field of the imaging lens 4000, according to the
fourth exemplary embodiment.
Fifth Exemplary Embodiment
[0110] FIG. 23 is a diagram of an optical arrangement of an imaging
lens 5000, according to a fifth exemplary embodiment.
[0111] The imaging lens 5000 includes, sequentially from the object
OBJ to the image plane IMG, a first lens 105 having a convex
surface toward object and positive refractive power, a second lens
205 having negative refractive power, a third lens 305 having
positive refractive power, a fourth lens 405 having a convex
surface toward image plane IMG and positive refractive power, and a
fifth lens 505 having negative refractive power.
[0112] Lens data of the fifth exemplary embodiment is as below.
TABLE-US-00009 TABLE IX Radius of Thickness or Refractive Index
Abbe Number Curvature Intervals (nd) (vd) OBJ infinity infinity 1*
1.655 0.470 1.544 56.09 2(ST)* 3.751 0.384 3* -19.592 0.290 1.643
22.4 4* 5.087 0.055 5* 5.406 0.646 1.544 56.09 6* -3.971 0.529 7*
54.118 0.686 1.544 56.09 8* -2.102 0.603 9* -1.092 0.470 1.544
56.09 10* -47.900 0.040 11 infinity 0.110 1.517 64.2 12 infinity
0.568 IMG infinity 0.000
TABLE-US-00010 TABLE X Surface K A B C D E F G 1 1.6636E-01
-5.6568E-03 5.9585E-02 -2.5924E-01 6.8378E-01 -9.9021E-01
7.4960E-01 -2.3434E-01 2 -3.3224E+01 8.4701E-02 -1.8802E-01
5.8439E-01 -1.3563E+00 1.8442E+00 -1.3443E+00 3.7683E-01 3
-3.6398E+01 -1.0255E-01 5.5096E-02 -1.1872E-01 1.4643E-01
-1.1902E-01 4 -1.1038E+00 -1.3252E-01 2.4349E-01 -3.7804E-01
6.2082E-01 -8.0362E-01 6.5542E-01 -2.3586E-01 5 -4.6807E+01
-7.2502E-02 1.2277E-01 -1.3182E-01 9.7452E-02 -9.0042E-02
8.5576E-02 -3.1506E-02 6 -2.9675E+01 -1.1385E-01 3.2069E-02
1.3279E-02 -1.3042E-02 1.8851E-01 -1.2802E-01 3.4162E-02 7
-9.9000E+01 -5.9598E-02 1.3496E-02 -1.2337E-02 -9.3661E-03
1.5149E-02 -8.7537E-03 1.7280E-03 8 -8.7039E+00 -1.0249E-01
8.1231E-02 -6.3081E-02 3.2671E-02 -8.7942E-03 1.1409E-03
-6.4613E-05 9 -2.1110E+00 -2.9682E-02 2.4721E-02 -5.0536E-02
4.3428E-02 -1.5865E-02 2.6859E-03 -1.7617E-04 10 9.9000E+01
2.8949E-02 -2.6613E-02 1.0014E-02 -2.2761E-03 3.0605E-04
-2.3029E-05 7.5744E-07
[0113] FIG. 24 is an aberration diagram of longitudinal spherical
aberration, astigmatic field curvature, and distortion of the
imaging lens 5000, according to the fifth exemplary embodiment.
FIG. 25 is an aberration diagram of comatic aberration of the
imaging lens 5000, according to the fifth exemplary embodiment.
FIG. 26 is a diagram of negative TV distortion of the imaging lens
5000, according to the fifth exemplary embodiment. FIG. 27 is a
graph of a CRA per field of the imaging lens 5000, according to the
fifth exemplary embodiment.
[0114] Table XI shows various optical specifications of the imaging
lenses 1000 to 5000 according to the first to fifth exemplary
embodiments, for example, optical total lengths (TL), focal lengths
(f), half FOV (.theta.), respective focal lengths (f1, f2, f3, f4,
and f5) of the imaging lenses 1000 to 5000, etc.
TABLE-US-00011 TABLE XI Specification Embodiment 1 Embodiment 2
Embodiment 3 Embodiment 4 Embodiment 5 Optical 4.73 mm 4.45 mm 4.45
mm 4.57 mm 4.85 mm Total Length (TL) Focal Length(f) 3.99 mm 3.47
mm 3.47 mm 3.80 mm 3.88 mm Half FOV (.theta.) 40.60 deg 44.58 deg
44.58 deg 41.95 deg 41.40 deg Focal Length of 4.17 mm 17.17 mm 4.48
mm 4.09 mm 5.02 mm First Lens (f1) Focal Length of -6.43 mm 3.37 mm
9.67 mm -6.49 mm -6.19 mm Second Lens (f2) Focal Length of 6.64 mm
-5.32 mm -10.66 mm 5.93 mm 4.29 mm Third Lens (f3) Focal Length of
3.99 mm 2.72 mm 2.86 mm 3.79 mm 3.72 mm Fourth Lens (f4) Focal
Length of -2.04 mm -2.00 mm -1.99 mm -1.94 mm -2.05 mm Fifth Lens
(f5) Object Side Radius 1.50 mm 2.17 mm 1.78 mm 1.50 mm 1.66 mm of
First Lens (R1) Object side Radius -1.11 mm -1.09 mm -1.09 mm -1.06
mm -1.09 mm of Fifth Lens (R.sub.9) Image Side Radius infinity
infinity infinity -1000.00 mm -47.90 mm of Fifth Lens (R.sub.10)
EPD 1.69 mm 1.45 mm 1.46 mm 1.69 mm 1.95 mm Tan.theta. 0.857 0.986
0.986 0.899 0.882 CRA.sub.max 34.5.degree. 35.degree. 35.degree.
37.4.degree. 35.04.degree.
[0115] Table XII shows the imaging lenses 1000 to 5000 of the first
to fifth exemplary embodiments satisfying CONDs. (1) to (13).
TABLE-US-00012 TABLE XII Conditions Embodiment 1 Embodiment 2
Embodiment 3 Embodiment 4 Embodiment 5 (1) -0.2 .ltoreq. (Y -
y.sub.p)/ -0.079 -0.134 -0.134 -0.07 -0.11 y.sub.p .ltoreq. -0.05
(2) (((1/f)*(Y/tan.theta.)) - -7.90% -13.40% -13.40% -7.00% -11.00%
1)*100 (3) 0.80 < TL/f < 1.5 1.18 1.28 1.28 1.2 1.25 (4) 0.7
< f/f.sub.4 < 2.5 1.11 1.27 1.21 1 1.04 (5) 1.0 < |
f/f.sub.5 | < 4.0 2.05 1.74 1.74 1.96 1.89 (6) 0.2 < R1/f
< 1.0 0.37 0.63 0.51 0.39 0.43 (7) f/EPD .ltoreq. 2.5 2.39 2.39
2.38 2.25 1.99 (8) 1.6 .ltoreq. N.sub.1-4 .ltoreq. 2.2 2.017 1.643
2.1 1.801 1.643 (9) 15 .ltoreq. V.sub.1-4 .ltoreq. 29 20.55 22.4
16.8 24.62 22.4 (10) 1.51 < N5 < 1.56 1.544 1.544 1.544 1.544
1.544 (11) 30.degree. .ltoreq. CRA.sub.max .ltoreq. 45.degree.
34.5.degree. 35.degree. 35.degree. 37.4.degree. 35.04.degree. (12)
TL/(2*yp) 0.691 0.651 0.651 0.667 0.709 (13) (R.sub.9 +
R.sub.10)/(R.sub.9 - R.sub.10) -1.000 -1.000 -1.000 -1.002
-1.047
[0116] The imaging lenses 1000 to 5000 of the above-described
exemplary embodiments have very short total lengths and
satisfactory optical performance.
[0117] The above-described imaging lens includes five lenses, and
has a total length that is appropriate for an ultra slim electronic
device.
[0118] Also, since the lenses in the imaging lens have aspheric
surfaces, the imaging lens has a reduced total length and a shape
that is appropriate for aberration correction. Thus, high image
quality may be obtained not only in the center of the image lens
but also within a wide FOV range.
[0119] The above-described exemplary embodiments may be applied to
various types of imaging apparatuses and image sensors that convert
an optical image formed on the imaging lens into an electric
signal. Also, the imaging apparatuses may be included in ultra slim
electronic devices.
[0120] FIG. 28 is a perspective view of an electronic device 8000
according to an exemplary embodiment.
[0121] The electronic device 8000 may have a body thickness t of
about 7 mm or less. The electronic device 8000 may be a very slim
mobile communication device, for example, a smartphone. An imaging
lens L and an image sensor 800 are provided inside the electronic
device 8000. The imaging lens L may be any one of the
above-described imaging lenses 1000, 2000, 3000, 4000, and 5000.
Since a total length of the imaging lens L is very short, about 5
mm or less, the imaging lens may be arranged in the electronic
device 8000 such that an optical axis direction of the imaging lens
corresponds to a direction of the body thickness t.
[0122] It should be understood that exemplary embodiments described
herein should be considered in a descriptive sense only and not for
purposes of limitation. Descriptions of features or aspects within
each exemplary embodiment should typically be considered as
available for other similar features or aspects in other exemplary
embodiments.
[0123] While one or more exemplary embodiments have been described
with reference to the figures, it will be understood by those of
ordinary skill in the art that various changes in form and details
may be made therein without departing from the spirit and scope as
defined by the following claims.
* * * * *